Lathe-chuck.



J. D.. BANKS.

LATHE CHUCK.

APPLICATION FILED APR. 26. 1915.

Patented Feb. 29, 1916.

@mi/bumsen QM W.

Wifcnaooao J. D. BANKS. LATHE CHUCK.

APPucATloN FILED APR. 2s. 1915.

l, 173, 1 59. A Patented Feb. 29, 1916.

3 SHEETS-SHEET 2.

THE CDLUMBIA PLANGQRAPH cu.. WASHINGTGN, D. C.

J. D. BANKS.

LATHE CHUCK.

APPucATloN man APR. 2s. 1915.

l 1 73, l 59. Patented Feb. 29, 1916.`

3 SHEETS-SHEET 3.

.efe-:5m E. Banks,

me COLUMBIA PLANoanAPN C0., WASHINGTON, n, c.

\ Philadelphia,

iran srarns JOI-IN D. BANKS, OF PHILADELPHIA, PENNSYLVANIA.

LA'IHE-CHUCK.

Application filed April 26, 1915.

T0 all Iwhom t may concern Be it known that I, Jol-1N D. BANKS, acitizen of the United States, residing at in the county of Philadelphiaand State of Pennsylvania, have invented certain new and usefulImprovements in Lathe-Chucks, of which the following is a specication.

My invention relates to improvements in lathe chucks, the object of theinvention being to provide a chuck of the character stated whichsupports the work and which is capable of a step by step rotary movementso as to hold the work in various positions, and enable the same to beoperated upon from many sides witho'utremoving the same from the chuck.

A further object is to provide a chuck in which the two jaws areoperated simultaneously to partially rotate them, and permit the turningof the work to present various sides thereof to the tool carried by thedrill spindle.

A further object is to provide improved means for imparting a partialrotary movement to the jaws of the chuck, and which operating meanspermits the positive locking of the chuck members at each position ofadj ustment.

l/Vith these and other objects in view, the invention consists incertain novel features cf construction and combinations and arrangementsof parts as will be more fully hereinafter described and pointed out inthe claims.

In the accompanying drawings: Figure 1 is a fragmentary view in sideelevation illustrating my improved chuekin position on the, bed of anordinary lathe. Fig. 2 is a fragmentary view in transverse section onthe line 2 2 of Fig. 1. Fig. 3 is a top plan view of my improved chuck.Fig. 4i is a view in longitudinal section on the line 4 4 of Fig. 3.Fig. 5 is a view in transverse section on the line 5 5 of Fig. 4, aportion of the mechanism being broken away for clearness ofillustration. Fig. 6` is a view in section through the center of thechuck, the view being taken on the line 6 6 of Fig. 4, and in' additionthe work is indicated in dotted lines. Fig. 7 is a perspective view ofone of the disks 17, and Fig. 8 is a fragmentary view in section on thelinev 8 8 of Fig. 6.

Specification of Letters Patent.

Patented Feb. 29, 1911i. Serial No. 23,919.

having the ordinary headstock 2 from which the spindle 3 projects.

41 is the supporting table of my improved chuck which is secured to theordinary lathe carriage 5, and is supported on the bed 1 in line withthe spindle 3. On the table al., a relatively heavy base 6 is formed,and may be cast integral with the table as desired. This baseconstitutes parallel side members 7 connected at their ends by crossbars 8. Two sliding members 9, 9, are guided in the base 8, and havelateral extensions 10 made with oppositely screw-threaded openings 11which engage the threaded portions of an adjusting screw l2. It is to beunderstood that this screw 12 is held against longitudinal movement inthe base, and is adapted to receive a crank wheel or other similardevice 13 at either end to turn the same and adjust the two slidingmembers 9 of the chuck toward and away from each other. Each slidingmember is providedwith a work gripping jaw 14., and each jaw 141 issecured to a horizontal arbor 15 mounted to turn in member 9, andpreferably having ball bearings 16 as shown. The arbors 15, at theirouter ends, have disks 17 fixed thereto. The disks 17 are illustrated ashaving outwardly projecting hubs 18, and said hubs are keyed onto thethreaded ends of the arbors forming a tight and secure juncturetherewith. Mov able disks 19 are located on the hubs 18, and arepositioned beside the disks 17, and nuts 2O are screwed onto thethreaded ends of the arbors 15, and washers 21 are interposed betweenthe nuts and the disks 19, so that the latter are securely held butpermitted a turning movement. The disks 17, one of which is shown inperspective in Fig. 7, are proA vided in their peripheries with recesses22, and with beveled faces 23 communicating with the walls of therecesses. The disks 19 are provided with spring-pressed pawls 24 whichproject through openings 25 in the disks 19, and have beveled ends 26 toengage in the recesses 22, and to ride the beveled faces 28 as will behereinafter explained. .Vhile, of course, the invention is not limitedto any particular number of such pawls, I have shown but a single pawlon each disk 19, and have connected each pawl with a fiat spring 27,tending to force the pawl inwardly into the recess 22.

One of the disks 17 is normally held against rotary movement by alocking dog 28, which is mounted in a recess 29 in one member 9, andpivotally connected at its inner end by a pin 30. The free end of thedog 28 is pressed upwardly by a coiled spring 31 into a recess 22 ofdisk 17 so as to positively lock the disk and the chuck jaw againstrotary movement. The disk 19, adjacent dog 28, is provided with a camsurface 32 which, when the disk is turned in one direction, operates toforce the dog 28 out of the recess 22, which operation will be morefully hereinafter explained. A horizontal shaft 33 is mounted in thebase 6, and is provided adjacent its ends with crank arms 34. rllhesecrank arms 34 are connected by links 35 with crank pins 36 on the disks19. A crank arm 37 is-iXed to the center of shaft 33, and an operatingrod 38 is connected to the crank arm 37. I have illustrated noparticular means for moving the rod 38, but it is to be understood thatany suitable mechanism may be so connected that the rod has to cause thesame to reciprocate and impart an oscillating movement to the shaft 33whenever desired to shift the position of the chuck.

An oscillating movement of the shaft 33 imparts an oscillating movementto the disks 19, and hence for convenience of description to distinguishthe disks 17 and 19, I shall hereinafter refer to the disks 19 asoscillating disks, and shall refer to the disks 17 as j aw carrieddisks, as they are secured to turn with the jaws of the chuck.

In Fig. G, I illustrate the work 38aL in dottedlines which is supportedbetween the jaws of the chuck. rihis work is provided with a pluralityof screw-threaded portions which are adapted to be engaged by the toolof the lathe, and as this particular work has four operating faceportions or faces, I have provided the jaws with four positions ofadjustment, but it is of course to be understood that any number ofpositions of adjustment may be had in accordance with the work.

When the parts are in normal position, the work 38a is clamped betweenthe jaws 14, and the dog 28 securely locks the parts against rotarymovement. When it is desired to shift the position of thechuck, shaft 33is oscillated by means of the rod 38, and this oscillation is impartedto the oscillating disks 19.

' rIhe first movement of one of the disks 19 by reason of the camsurface 32 operates to depress the dog 28 from the recess 22. This samemovement of the disks 19 moves the pawls 24 out of the recesses 22 alongthe beveled surfaces 23 until they spring into the next recesses 22.This last-named movement of the disks 19 is a retrograde movement, andis instantly followed by a forward movement which, by reason of theengagement of the pawls 24, in the recesses 22,

will turn disks 17 and the chuck jaws a quarter turn or in other words,a movement equal to the length of movement/ofthe oscillating disks, andas I have shown the disk 17 with four recesses 22, there will be' aquarter turn imparted at each operation. As soon as the movement iscompleted, the dog 28 will spring into the next notch 22, and securelyhold the parts against accidental movement. The pawls 24 in theiroperation constitute ratchet means, and hence I would have it understoodthat I may employ other forms of ratchet means to connect thedisks.

In order that the crank arms 34 may have always the same positionrelative to the shaft 33 and the disks 19, I have splined the crank armsto slide on the shaft 33, and have provided the members 9 with pins 39which project into segmental grooves 40 in the hub portions 41 whichslide on the shaft 33, and compel the crank arms and members 9 to movetogether.

Various slight changes might be made in the general form and arrangementof parts described without departing from my invention, and hence I donot limit myself to the precise details set forth, but consider myselfat liberty to make such changes and Y alterations as fairly fall withinthe spirit and scope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A chuck of the` character described, comprising a support, rotaryjaws mounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, and means operated by the other shaft forturning the jaws, substantially as described.

2. A chuck of the character described, comprising a support, rotary jawsmounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, means operated by the other shaft for turningthe jaws, and means locking the jaws against turning movement,substantially as described.

3. A chuck of the character described, comprising a support, rotary jawsmounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws t0- wardand away from each other, disks Xed to turn with the jaws, oscillatingdisks adjacent the first-mentioned disks, pawls on the oscillating disksengaging the first-mentioned disks, crank arms on the other of saidshafts, and links connecting the crank arms and oscillating disks,substantially as described.

4. A chuck of the character described,

comprising a support, rotary jaws mounted in the support, a pair ofparallel shafts located below the jaws, means operated by one of saidshafts for moving the jaws toward and away from each other, disks fixedto turn with the jaws, oscillating disks adj acent the first-mentioneddisks, pawls on the oscillating disks engaging the first-mentioneddisks, crank arms on the other of said shafts, and links connecting thecrank arms and oscillating disks, said arms splined to slide on theshaft, substantially as described.

5. A chuck of the character described, comprising a support, rotary jawsmounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, disks fixed to turn with the jaws, oscillatingdisks adjacent the first-mentioned disks, pawls on the oscillating disksengaging the first-mentioned disks, crank arms on the other of saidshafts, links connecting the crank arms and oscillating disks, meansnormally holding the jaws against movement, said last-mentioned meansreleased by the movement of the oscillating disks, substantially asdescribed.

6. A chuck of the character described, comprising a support, rotary jawsmounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, disks Xed to turn with the jaws, oscillatingdisks adjacent the first-mentioned disks, pawls on the oscillating disksengaging the rst-mentioned disks, crank arms on the other of saidshafts, links connecting the crank arms and oscillating disks, said armssplined to slide on the shaft, means normally holding the jaws againstmovement, said last-mentioned means released by the movement of theoscillating disks, substantially as described.

7. A chuck of the character described, comprising a support, rotary jawsmounted Vin the support, a pair 0f parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, disks fixed to turn with the jaws, oscillatingdisks adj acent the first-mentioned disks, pawls on the oscillatingdisks engaging the firstmentioned disks, crank arms on the other of saidshafts, links connecting the crank arms and oscillating disks, aspringpressed locking dog engaging one of the iirst-mentioned disks andholding the same against movement, and one of said oscillating diskshaving a cam thereon engaging and releasing the dog when the disk isoscillated in one direction, substantially as described.

8. A chuck of the character described, comprising a support, rotary jawsmounted in the support, a pair of parallel shafts located below thejaws, means operated by one of said shafts for moving the jaws towardand away from each other, disks fixed to turn with the jaws, oscillatingdisks adjay cent the first-mentioned disks, pawls on the oscillatingdisks engaging the first-mentioned disks, crank arms on the other ofsaid shafts, links connecting the crank arms and oscillating disks, saidarms splined to slide on the shaft, a spring-pressed locking dogengaging one of the first-mentioned disks and holding the same againstmovement, and one of said oscillating disks having a cam thereonengaging and releasing the dog when the disk is oscillated in onedirection, substantially as described.

9. A chuck of the character described, comprising a support, two membersmount-- ed to slide on the support, rotary jaws carried by the members,an oscillating shaft mounted in the support, oscillating disks carriedby the members, means operated by the disks to turn the jaws, linksconnected to the disks, crank arms connected to the links and havinggrooved hubs splined to slide on the shaft, and pins on the membersprojecting into the grooves of the hubs compelling the crank arms tomove with the members, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN D. BANKS.

Witnesses:

MARIE JACKSON, CHAs. E. Po'r'rs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

